Year	Percent
1950	12.53193
1955	11.20167
1960	11.41184
1965	11.71924
1970	12.22271
1975	12.62972
1980	13.02413
1985	12.10742
1990	10.69087
1995	9.52224
2000	8.4209
2005	7.70239
2010	6.89324
2015	6.39106
2020	5.92355
2025	5.49922
2030	4.88946
2035	4.61328
2040	4.59656
2045	4.58732
2050	4.52439
2055	4.46288
2060	4.40345
2065	4.37175
2070	4.40244
2075	4.47586
2080	4.53017
2085	4.55443
2090	4.55672
2095	4.5691
2100	4.59748