Year	Percent
1950	16.58045
1955	18.07056
1960	18.51056
1965	18.37255
1970	17.68563
1975	17.12202
1980	16.52905
1985	15.22769
1990	14.16623
1995	13.8069
2000	12.77249
2005	10.78252
2010	9.80064
2015	9.18902
2020	8.8572
2025	8.27435
2030	7.57985
2035	6.91523
2040	6.36759
2045	5.9825
2050	5.70573
2055	5.44483
2060	5.17236
2065	4.90599
2070	4.69596
2075	4.54986
2080	4.46224
2085	4.40258
2090	4.35381
2095	4.30038
2100	4.25493