Year	Percent
1950	12.94537
1955	13.40329
1960	13.13966
1965	13.68102
1970	14.15167
1975	14.53705
1980	14.81228
1985	15.36436
1990	15.65703
1995	15.50301
2000	15.73579
2005	15.82103
2010	16.18772
2015	15.24121
2020	13.55465
2025	12.69942
2030	11.74033
2035	10.92515
2040	10.16213
2045	9.42252
2050	8.70329
2055	8.03695
2060	7.4756
2065	7.01227
2070	6.61578
2075	6.28727
2080	6.00502
2085	5.7672
2090	5.58172
2095	5.44191
2100	5.32549