Year	Percent
1950	13.55275
1955	13.45979
1960	15.23957
1965	15.27084
1970	15.03026
1975	14.9201
1980	15.68385
1985	14.07184
1990	12.605
1995	11.80109
2000	11.21648
2005	10.72781
2010	9.67758
2015	8.81855
2020	8.36754
2025	7.74844
2030	7.13557
2035	6.57325
2040	6.1129
2045	5.74852
2050	5.47298
2055	5.24414
2060	5.05347
2065	4.87698
2070	4.74895
2075	4.65025
2080	4.58421
2085	4.53892
2090	4.50206
2095	4.4754
2100	4.45319