Year	Percent
1950	28.34125
1955	30.97686
1960	33.36183
1965	34.50257
1970	32.35497
1975	25.93212
1980	32.62383
1985	32.42171
1990	33.86816
1995	33.46612
2000	34.54791
2005	37.50459
2010	37.43101
2015	36.89892
2020	35.64949
2025	34.14892
2030	32.45679
2035	31.51142
2040	30.92979
2045	30.37294
2050	29.74294
2055	28.62527
2060	27.62291
2065	26.77314
2070	26.11304
2075	25.59081
2080	25.10627
2085	24.60505
2090	24.10649
2095	23.65543
2100	23.30163