Year	Percent
1950	11.02669
1955	10.33678
1960	9.22153
1965	9.58822
1970	10.76435
1975	11.50737
1980	11.67298
1985	11.33318
1990	10.89224
1995	10.47985
2000	10.44327
2005	10.16587
2010	9.89325
2015	9.25697
2020	9.08712
2025	8.7931
2030	8.44141
2035	7.99263
2040	7.57675
2045	7.20015
2050	6.85471
2055	6.53406
2060	6.23719
2065	5.96896
2070	5.73355
2075	5.53776
2080	5.37882
2085	5.25194
2090	5.14046
2095	5.05156
2100	4.97848