Year	Percent
1950	26.44158
1955	25.21114
1960	26.73677
1965	26.61546
1970	28.00431
1975	29.32528
1980	32.38413
1985	35.41099
1990	37.69826
1995	38.71309
2000	36.78659
2005	34.94703
2010	31.43913
2015	29.70148
2020	28.23597
2025	25.59288
2030	23.54462
2035	20.86487
2040	19.28971
2045	19.17656
2050	19.74612
2055	20.27111
2060	20.29256
2065	19.97806
2070	19.55686
2075	19.44216
2080	19.87338
2085	20.53368
2090	20.95626
2095	20.91451
2100	20.51431