Year	Percent
1950	31.33796
1955	29.6327
1960	27.62478
1965	26.07933
1970	27.46017
1975	30.28969
1980	33.16629
1985	34.87927
1990	33.80305
1995	31.43416
2000	28.94543
2005	27.0793
2010	26.89212
2015	27.08907
2020	26.36122
2025	24.90214
2030	24.09007
2035	23.20799
2040	23.06711
2045	23.30566
2050	23.12489
2055	22.81429
2060	22.48402
2065	22.23188
2070	22.08654
2075	22.04108
2080	21.97155
2085	21.81163
2090	21.58066
2095	21.34265
2100	21.13177