Year	Percent
1950	20.27625
1955	20.91627
1960	18.34097
1965	18.58765
1970	21.29078
1975	22.03671
1980	26.40636
1985	25.81405
1990	24.53983
1995	26.31392
2000	26.23016
2005	28.4536
2010	28.14958
2015	27.95144
2020	28.3316
2025	29.82497
2030	32.28119
2035	32.22278
2040	30.01052
2045	26.51913
2050	24.38197
2055	24.5132
2060	25.92017
2065	27.21057
2070	26.64808
2075	25.48564
2080	24.6387
2085	24.49028
2090	24.88476
2095	25.29933
2100	25.24473