Year	Percent
1950	12.55016
1955	12.08593
1960	15.10492
1965	14.72823
1970	14.74747
1975	14.63659
1980	15.04832
1985	15.55514
1990	15.36465
1995	15.48584
2000	15.32852
2005	15.18291
2010	15.46764
2015	15.71037
2020	15.26117
2025	14.70248
2030	14.26557
2035	13.88465
2040	13.4684
2045	13.00796
2050	12.50752
2055	11.99582
2060	11.50613
2065	11.0474
2070	10.62029
2075	10.21054
2080	9.80635
2085	9.42205
2090	9.0661
2095	8.72433
2100	8.40365