Year	Percent
1950	12.37493
1955	12.05619
1960	13.61122
1965	14.52626
1970	14.71747
1975	14.63306
1980	14.59908
1985	14.8462
1990	15.45502
1995	15.40153
2000	14.67347
2005	14.0501
2010	13.62898
2015	13.43241
2020	13.24145
2025	12.61311
2030	11.9621
2035	11.39306
2040	10.94004
2045	10.55394
2050	10.17444
2055	9.78249
2060	9.36945
2065	9.00268
2070	8.6698
2075	8.39176
2080	8.10028
2085	7.8113
2090	7.53771
2095	7.28259
2100	7.0627