Year	Percent
1950	28.6451
1955	29.26082
1960	30.5441
1965	30.07482
1970	30.29876
1975	31.531
1980	32.08887
1985	32.73903
1990	32.63219
1995	30.54887
2000	30.27891
2005	30.47971
2010	30.72661
2015	30.69045
2020	29.16517
2025	26.90515
2030	24.49563
2035	22.87436
2040	22.47076
2045	22.40757
2050	22.48103
2055	22.03673
2060	21.40068
2065	20.9359
2070	20.86853
2075	21.12963
2080	21.41371
2085	21.46504
2090	21.24648
2095	20.94068
2100	20.76413