Year	Percent
1950	28.55801
1955	27.87262
1960	27.15317
1965	27.49685
1970	28.04195
1975	29.69189
1980	30.34505
1985	32.93376
1990	33.7383
1995	32.64304
2000	30.60817
2005	28.85141
2010	27.13042
2015	26.07506
2020	25.06594
2025	24.08815
2030	23.42465
2035	22.69623
2040	22.2665
2045	22.07653
2050	21.96486
2055	21.94735
2060	21.94678
2065	21.89294
2070	21.78222
2075	21.64342
2080	21.51611
2085	21.40403
2090	21.28116
2095	21.13031
2100	20.94793