Year	Percent
1950	30.09418
1955	28.48137
1960	28.87157
1965	27.17656
1970	27.26264
1975	29.40194
1980	31.44243
1985	32.38511
1990	31.72314
1995	31.07875
2000	31.93561
2005	33.11192
2010	33.71506
2015	32.396
2020	28.92877
2025	25.59328
2030	23.4101
2035	22.27126
2040	22.53541
2045	23.09206
2050	22.82416
2055	22.13559
2060	21.46974
2065	21.208
2070	21.46154
2075	21.98727
2080	22.31977
2085	22.20574
2090	21.81504
2095	21.46487
2100	21.34881