Year	Percent
1950	16.64751
1955	17.08105
1960	17.65996
1965	17.80189
1970	17.41237
1975	15.41708
1980	13.20717
1985	11.27836
1990	9.74299
1995	8.87458
2000	7.76217
2005	6.77122
2010	6.31256
2015	5.89459
2020	5.19541
2025	4.86664
2030	4.80441
2035	4.74192
2040	4.62327
2045	4.51197
2050	4.41475
2055	4.35849
2060	4.372
2065	4.43128
2070	4.47069
2075	4.47855
2080	4.46634
2085	4.47114
2090	4.50232
2095	4.55596
2100	4.60188