Year	Percent
1950	13.58419
1955	11.79836
1960	10.66207
1965	11.26349
1970	12.58163
1975	15.60691
1980	10.9692
1985	12.49472
1990	13.20182
1995	12.58596
2000	11.91208
2005	10.47461
2010	9.76463
2015	9.29447
2020	9.3955
2025	8.6877
2030	8.12792
2035	7.58442
2040	7.12932
2045	6.79385
2050	6.56883
2055	6.37512
2060	6.18523
2065	5.98422
2070	5.81472
2075	5.68305
2080	5.58252
2085	5.50587
2090	5.42793
2095	5.35056
2100	5.27306