Year	Percent
1950	12.90977
1955	12.77702
1960	13.93996
1965	13.85732
1970	13.71895
1975	13.47616
1980	13.36337
1985	13.01465
1990	12.43846
1995	11.30188
2000	10.34352
2005	10.03309
2010	9.3031
2015	8.77186
2020	8.42553
2025	7.63465
2030	7.18532
2035	6.70603
2040	6.36199
2045	6.06439
2050	5.8256
2055	5.59726
2060	5.38326
2065	5.20347
2070	5.08065
2075	4.99229
2080	4.93816
2085	4.88075
2090	4.82675
2095	4.77573
2100	4.74163