Year	Percent
1950	17.50314
1955	19.83685
1960	18.94635
1965	18.11803
1970	17.3061
1975	16.61286
1980	16.19895
1985	15.65235
1990	15.25495
1995	14.41498
2000	13.7811
2005	13.24046
2010	11.69959
2015	11.2415
2020	10.7475
2025	10.20292
2030	9.67351
2035	9.18335
2040	8.71847
2045	8.29953
2050	7.92065
2055	7.5538
2060	7.19458
2065	6.87786
2070	6.59671
2075	6.35319
2080	6.13622
2085	5.94144
2090	5.76767
2095	5.61146
2100	5.47191