Year	Percent
1950	12.01781
1955	10.70644
1960	15.27356
1965	15.39029
1970	14.46614
1975	12.69392
1980	12.71528
1985	12.36201
1990	11.22421
1995	10.84064
2000	10.6113
2005	9.42801
2010	8.67429
2015	7.50674
2020	7.515
2025	7.04924
2030	6.51738
2035	6.03537
2040	5.65509
2045	5.39108
2050	5.27201
2055	5.21582
2060	5.11103
2065	4.98239
2070	4.86986
2075	4.81501
2080	4.80839
2085	4.82641
2090	4.81879
2095	4.78237
2100	4.73551