Year	Percent
1950	27.21375
1955	27.04191
1960	26.5894
1965	27.04691
1970	28.21665
1975	27.61348
1980	33.58018
1985	35.76476
1990	34.67199
1995	36.61915
2000	34.31055
2005	39.46886
2010	46.11587
2015	45.57221
2020	42.54428
2025	39.97554
2030	35.8829
2035	33.54412
2040	32.7337
2045	31.85613
2050	31.01021
2055	29.58202
2060	28.01768
2065	26.7363
2070	25.85202
2075	25.40573
2080	25.12317
2085	24.75815
2090	24.29358
2095	23.79371
2100	23.38467