Year	Percent
1950	29.04966
1955	29.88006
1960	28.98491
1965	25.14874
1970	22.08118
1975	22.14957
1980	24.57279
1985	27.90462
1990	30.90307
1995	31.51642
2000	31.51815
2005	31.00716
2010	31.23055
2015	31.86278
2020	31.32321
2025	30.0242
2030	28.87251
2035	28.35438
2040	28.23917
2045	27.88647
2050	27.10623
2055	25.63004
2060	24.43795
2065	23.63474
2070	23.13834
2075	22.74823
2080	22.30027
2085	21.7719
2090	21.26293
2095	20.8857
2100	20.66032