Year	Percent
1950	37.94557
1955	34.49093
1960	29.90194
1965	25.10592
1970	23.80034
1975	25.69389
1980	31.74606
1985	37.66648
1990	39.07025
1995	38.48236
2000	36.16866
2005	32.63833
2010	31.8111
2015	30.31804
2020	27.41015
2025	22.56896
2030	19.04855
2035	16.66665
2040	16.64407
2045	18.07116
2050	19.17602
2055	19.64083
2060	19.1417
2065	18.49987
2070	18.22575
2075	18.8213
2080	19.88299
2085	20.72078
2090	20.88873
2095	20.47576
2100	19.87012