Year	Percent
1950	29.14046
1955	27.33966
1960	25.71392
1965	25.16914
1970	25.72702
1975	28.06516
1980	29.64417
1985	31.80615
1990	31.52686
1995	31.29902
2000	29.10159
2005	27.73658
2010	26.89106
2015	26.35916
2020	26.69224
2025	26.28206
2030	25.76162
2035	24.80192
2040	24.34995
2045	24.33514
2050	23.95425
2055	23.60028
2060	23.2005
2065	22.79541
2070	22.43391
2075	22.15506
2080	21.91572
2085	21.67819
2090	21.43781
2095	21.19517
2100	20.96988