Year	Percent
1950	28.95453
1955	30.31813
1960	33.81816
1965	32.21336
1970	32.88997
1975	31.40311
1980	32.27602
1985	29.04365
1990	30.93099
1995	29.20781
2000	29.68431
2005	29.68177
2010	29.08844
2015	29.03693
2020	29.01868
2025	29.48712
2030	30.35733
2035	31.34018
2040	32.05837
2045	32.51128
2050	32.75593
2055	32.77676
2060	32.64082
2065	32.31044
2070	31.78084
2075	31.10259
2080	30.36443
2085	29.64613
2090	28.99001
2095	28.38458
2100	27.79621