Year	Percent
1950	15.7819
1955	15.94109
1960	16.60894
1965	17.16309
1970	17.87553
1975	18.35845
1980	19.39383
1985	19.85519
1990	19.62271
1995	19.4388
2000	19.36527
2005	19.0957
2010	18.67015
2015	17.82657
2020	16.9165
2025	16.09326
2030	15.36398
2035	14.63443
2040	13.90129
2045	13.14505
2050	12.41301
2055	11.76353
2060	11.15494
2065	10.61568
2070	10.0994
2075	9.60156
2080	9.13524
2085	8.70564
2090	8.29282
2095	7.92636
2100	7.59158