Year	Percent
1950	19.13682
1955	18.25609
1960	18.1649
1965	17.16874
1970	16.3605
1975	16.12822
1980	16.31972
1985	16.49408
1990	17.11582
1995	19.62299
2000	21.76235
2005	25.23247
2010	29.02023
2015	30.43826
2020	30.56482
2025	29.98034
2030	30.15607
2035	29.01857
2040	28.14591
2045	26.86087
2050	24.06389
2055	23.59066
2060	24.32732
2065	24.7023
2070	24.37837
2075	23.50507
2080	22.90571
2085	22.8445
2090	23.0321
2095	23.13264
2100	22.98873