Year	Percent
1950	11.78524
1955	11.00099
1960	11.6346
1965	12.16122
1970	12.27551
1975	12.54708
1980	11.75041
1985	10.95046
1990	10.99978
1995	10.93597
2000	9.87435
2005	9.00937
2010	8.57869
2015	7.66185
2020	6.80022
2025	6.45446
2030	6.04802
2035	5.64904
2040	5.30805
2045	5.04526
2050	4.84073
2055	4.69057
2060	4.59662
2065	4.51664
2070	4.45377
2075	4.41498
2080	4.39649
2085	4.40208
2090	4.41837
2095	4.43107
2100	4.43861