Year	Percent
1950	18.26147
1955	20.52899
1960	19.95031
1965	20.63073
1970	19.6258
1975	17.51826
1980	16.19131
1985	14.99164
1990	14.4168
1995	14.79882
2000	14.73299
2005	14.03063
2010	13.98424
2015	12.57879
2020	11.37697
2025	10.93771
2030	10.84115
2035	10.82131
2040	10.50622
2045	9.8247
2050	9.01638
2055	8.38235
2060	8.06284
2065	7.8768
2070	7.61465
2075	7.17438
2080	6.66172
2085	6.21675
2090	5.93769
2095	5.7738
2100	5.63577