Year	Percent
1950	10.84221
1955	10.17356
1960	11.77243
1965	13.63957
1970	14.35113
1975	13.08456
1980	14.19952
1985	13.31157
1990	11.9525
1995	11.56102
2000	10.52899
2005	12.68493
2010	11.73214
2015	10.49103
2020	9.17472
2025	9.02861
2030	8.8585
2035	8.49729
2040	8.06616
2045	7.64238
2050	7.27942
2055	7.00657
2060	6.76918
2065	6.54024
2070	6.3104
2075	6.11895
2080	5.96393
2085	5.84314
2090	5.74485
2095	5.65098
2100	5.55407