year	time
1900	246.0
1904	245.4
1908	243.4
1912	236.8
1920	241.9
1924	233.6
1928	233.2
1932	231.2
1936	227.8
1948	229.8
1952	225.2
1956	221.2
1960	215.6
1964	218.1
1968	214.9
1972	216.3
1976	219.2
1980	218.4
1984	212.5
1988	216.0
1992	220.1
1996	215.8