Year	Percent
1950	12.20517
1955	11.95755
1960	12.41929
1965	12.3443
1970	12.1938
1975	12.08853
1980	13.62096
1985	11.52505
1990	10.33295
1995	9.6612
2000	9.94499
2005	9.25711
2010	8.00679
2015	7.43763
2020	7.43919
2025	7.15647
2030	6.85795
2035	6.58769
2040	6.32081
2045	6.06923
2050	5.87986
2055	5.75819
2060	5.65837
2065	5.55321
2070	5.43004
2075	5.31321
2080	5.22153
2085	5.15483
2090	5.10584
2095	5.05757
2100	5.00536