Year	Percent
1950	17.93189
1955	18.79453
1960	18.52021
1965	18.36025
1970	17.35623
1975	14.80214
1980	14.37135
1985	13.80821
1990	12.66529
1995	11.62084
2000	10.27527
2005	9.50164
2010	8.55655
2015	7.75115
2020	7.12541
2025	6.55767
2030	6.11357
2035	5.75576
2040	5.47101
2045	5.24891
2050	5.06262
2055	4.91437
2060	4.79468
2065	4.70574
2070	4.64145
2075	4.60149
2080	4.57197
2085	4.55849
2090	4.55049
2095	4.55014
2100	4.55142