Year	Percent
1950	11.96761
1955	12.15403
1960	12.30022
1965	10.85274
1970	11.0926
1975	11.19112
1980	11.51236
1985	11.97733
1990	12.15382
1995	12.68221
2000	13.62987
2005	11.65132
2010	10.0362
2015	8.75675
2020	8.31613
2025	7.65072
2030	7.36317
2035	6.85479
2040	6.29894
2045	5.82371
2050	5.51018
2055	5.33931
2060	5.244
2065	5.15038
2070	5.04301
2075	4.94605
2080	4.89607
2085	4.89831
2090	4.92158
2095	4.93227
2100	4.91415