Year	Percent
1950	21.74458
1955	20.31697
1960	19.22544
1965	17.4807
1970	15.77339
1975	14.84485
1980	13.93702
1985	13.17137
1990	12.45302
1995	12.29866
2000	13.83791
2005	17.08515
2010	19.83238
2015	21.63183
2020	22.81389
2025	23.7422
2030	25.80816
2035	26.14556
2040	24.96567
2045	23.03148
2050	21.66283
2055	23.20845
2060	25.26709
2065	26.92605
2070	26.9079
2075	25.177
2080	24.10842
2085	23.97837
2090	24.5135
2095	25.0557
2100	25.09375