Year	Percent
1950	21.5409
1955	22.76669
1960	22.82538
1965	22.17666
1970	20.43687
1975	18.17994
1980	17.36813
1985	17.61211
1990	20.10952
1995	22.42147
2000	23.96423
2005	25.13107
2010	25.14927
2015	26.62441
2020	27.85311
2025	27.95952
2030	26.95176
2035	24.48634
2040	22.44527
2045	21.79658
2050	23.02427
2055	24.72087
2060	25.54293
2065	25.09913
2070	23.82645
2075	22.81077
2080	22.58589
2085	22.94498
2090	23.30647
2095	23.24989
2100	22.78704