\begin{tabular}
Time&sea level pressure difference\\
months since 1960-01-01&mb\\
Dec 1863 - Mar 1864&-0.91\\
Dec 1864 - Mar 1865&-1.38\\
Dec 1865 - Mar 1866&0.33\\
Dec 1866 - Mar 1867&-1.53\\
Dec 1867 - Mar 1868&2.53\\
Dec 1868 - Mar 1869&1.46\\
Dec 1869 - Mar 1870&-3.08\\
Dec 1870 - Mar 1871&-1.16\\
Dec 1871 - Mar 1872&-0.91\\
Dec 1872 - Mar 1873&-0.66\\
Dec 1873 - Mar 1874&2.05\\
Dec 1874 - Mar 1875&-1.5\\
Dec 1875 - Mar 1876&0.02\\
Dec 1876 - Mar 1877&-0.13\\
Dec 1877 - Mar 1878&1.2\\
Dec 1878 - Mar 1879&-2.34\\
Dec 1879 - Mar 1880&0.67\\
Dec 1880 - Mar 1881&-3.87\\
Dec 1881 - Mar 1882&3.55\\
Dec 1882 - Mar 1883&-0.4\\
Dec 1883 - Mar 1884&1.21\\
Dec 1884 - Mar 1885&-1.03\\
Dec 1885 - Mar 1886&-1.28\\
Dec 1886 - Mar 1887&0.26\\
Dec 1887 - Mar 1888&-2.86\\
Dec 1888 - Mar 1889&-0.21\\
Dec 1889 - Mar 1890&1.55\\
Dec 1890 - Mar 1891&-0.98\\
Dec 1891 - Mar 1892&-2.13\\
Dec 1892 - Mar 1893&-1.22\\
Dec 1893 - Mar 1894&2.43\\
Dec 1894 - Mar 1895&-4.01\\
Dec 1895 - Mar 1896&0.9\\
Dec 1896 - Mar 1897&0.86\\
Dec 1897 - Mar 1898&0.8\\
Dec 1898 - Mar 1899&-0.15\\
Dec 1899 - Mar 1900&-2.25\\
Dec 1900 - Mar 1901&-0.51\\
Dec 1901 - Mar 1902&-1.55\\
Dec 1902 - Mar 1903&3.58\\
Dec 1903 - Mar 1904&0.06\\
Dec 1904 - Mar 1905&1.71\\
Dec 1905 - Mar 1906&1.8\\
Dec 1906 - Mar 1907&1.79\\
Dec 1907 - Mar 1908&1.2\\
Dec 1908 - Mar 1909&-0.19\\
Dec 1909 - Mar 1910&1.85\\
Dec 1910 - Mar 1911&0.09\\
Dec 1911 - Mar 1912&0.06\\
Dec 1912 - Mar 1913&2.43\\
Dec 1913 - Mar 1914&1.24\\
Dec 1914 - Mar 1915&-0.37\\
Dec 1915 - Mar 1916&-0.86\\
Dec 1916 - Mar 1917&-3.86\\
Dec 1917 - Mar 1918&-0.97\\
Dec 1918 - Mar 1919&-0.97\\
Dec 1919 - Mar 1920&2.89\\
Dec 1920 - Mar 1921&1.39\\
Dec 1921 - Mar 1922&1.61\\
Dec 1922 - Mar 1923&1.49\\
Dec 1923 - Mar 1924&-1.28\\
Dec 1924 - Mar 1925&2.12\\
Dec 1925 - Mar 1926&-0.08\\
Dec 1926 - Mar 1927&1.46\\
Dec 1927 - Mar 1928&0.42\\
Dec 1928 - Mar 1929&-1.21\\
Dec 1929 - Mar 1930&0.71\\
Dec 1930 - Mar 1931&-0.34\\
Dec 1931 - Mar 1932&-0.69\\
Dec 1932 - Mar 1933&0.07\\
Dec 1933 - Mar 1934&0.64\\
Dec 1934 - Mar 1935&0.74\\
Dec 1935 - Mar 1936&-3.94\\
Dec 1936 - Mar 1937&0.51\\
Dec 1937 - Mar 1938&1.53\\
Dec 1938 - Mar 1939&0.18\\
Dec 1939 - Mar 1940&-2.95\\
Dec 1940 - Mar 1941&-2.43\\
Dec 1941 - Mar 1942&-0.73\\
Dec 1942 - Mar 1943&1.24\\
Dec 1943 - Mar 1944&0.39\\
Dec 1944 - Mar 1945&1.38\\
Dec 1945 - Mar 1946&0.06\\
Dec 1946 - Mar 1947&-2.8\\
Dec 1947 - Mar 1948&1.1\\
Dec 1948 - Mar 1949&1.61\\
Dec 1949 - Mar 1950&1.16\\
Dec 1950 - Mar 1951&-1.4\\
Dec 1951 - Mar 1952&0.61\\
Dec 1952 - Mar 1953&-0.04\\
Dec 1953 - Mar 1954&-0.05\\
Dec 1954 - Mar 1955&-2.63\\
Dec 1955 - Mar 1956&-1.86\\
Dec 1956 - Mar 1957&1.27\\
Dec 1957 - Mar 1958&-1.19\\
Dec 1958 - Mar 1959&-0.55\\
Dec 1959 - Mar 1960&-1.67\\
Dec 1960 - Mar 1961&1.56\\
Dec 1961 - Mar 1962&-2.5\\
Dec 1962 - Mar 1963&-3.66\\
Dec 1963 - Mar 1964&-2.94\\
Dec 1964 - Mar 1965&-2.99\\
Dec 1965 - Mar 1966&-1.83\\
Dec 1966 - Mar 1967&1.05\\
Dec 1967 - Mar 1968&-1.2\\
Dec 1968 - Mar 1969&-4.9\\
Dec 1969 - Mar 1970&-2.01\\
Dec 1970 - Mar 1971&-1.13\\
Dec 1971 - Mar 1972&0.16\\
Dec 1972 - Mar 1973&2.24\\
Dec 1973 - Mar 1974&1.02\\
Dec 1974 - Mar 1975&1.38\\
Dec 1975 - Mar 1976&1.14\\
Dec 1976 - Mar 1977&-2.28\\
Dec 1977 - Mar 1978&-0.02\\
Dec 1978 - Mar 1979&-2.36\\
Dec 1979 - Mar 1980&0.35\\
Dec 1980 - Mar 1981&1.77\\
Dec 1981 - Mar 1982&0.59\\
Dec 1982 - Mar 1983&4.13\\
Dec 1983 - Mar 1984&1.35\\
Dec 1984 - Mar 1985&-0.82\\
Dec 1985 - Mar 1986&0.28\\
Dec 1986 - Mar 1987&-0.75\\
Dec 1987 - Mar 1988&0.49\\
Dec 1988 - Mar 1989&4.73\\
Dec 1989 - Mar 1990&3.66\\
Dec 1990 - Mar 1991&0.8\\
Dec 1991 - Mar 1992&2.34\\
Dec 1992 - Mar 1993&2.37\\
Dec 1993 - Mar 1994&2.03\\
Dec 1994 - Mar 1995&3.37\\
\end{tabular}
