Year	Percent
1950	28.86925
1955	27.90064
1960	26.97888
1965	27.13277
1970	27.52523
1975	29.41699
1980	31.69334
1985	33.31821
1990	34.35598
1995	33.80512
2000	32.65773
2005	31.75576
2010	31.37904
2015	31.27537
2020	30.90617
2025	29.82297
2030	28.21431
2035	26.61165
2040	25.4444
2045	24.62423
2050	23.86232
2055	23.26433
2060	22.69909
2065	22.20017
2070	21.80109
2075	21.53156
2080	21.35829
2085	21.2246
2090	21.08933
2095	20.94768
2100	20.81191