Year	Percent
1950	26.90983
1955	25.16879
1960	22.28703
1965	22.10169
1970	24.15162
1975	26.84186
1980	28.45425
1985	29.54908
1990	28.56551
1995	29.50885
2000	31.45832
2005	33.18906
2010	32.29548
2015	27.41978
2020	24.44057
2025	23.46297
2030	24.63894
2035	26.20195
2040	26.65166
2045	25.73671
2050	24.10644
2055	22.95989
2060	22.80061
2065	23.30984
2070	23.7722
2075	23.66982
2080	23.0247
2085	22.2645
2090	21.8
2095	21.74339
2100	21.88914