Year	Percent
1950	22.42156
1955	20.91318
1960	21.57037
1965	19.87437
1970	20.09464
1975	21.80398
1980	23.94906
1985	27.47973
1990	30.21534
1995	32.10725
2000	32.45565
2005	32.16913
2010	31.92151
2015	31.65319
2020	31.22782
2025	30.1022
2030	29.26873
2035	28.10219
2040	27.01139
2045	26.13617
2050	24.899
2055	23.80175
2060	22.82542
2065	22.06754
2070	21.50361
2075	21.03555
2080	20.56828
2085	20.12744
2090	19.75685
2095	19.47329
2100	19.28281