Year	Percent
1950	20.06016
1955	21.97023
1960	21.17768
1965	20.89823
1970	19.61344
1975	17.96087
1980	17.29425
1985	16.45107
1990	17.56099
1995	19.68745
2000	20.96808
2005	21.59187
2010	21.18188
2015	20.78464
2020	21.29465
2025	21.72101
2030	21.8634
2035	21.40411
2040	21.1022
2045	21.11692
2050	21.63939
2055	22.69416
2060	23.22638
2065	23.43362
2070	23.29514
2075	22.87241
2080	22.81419
2085	22.98747
2090	23.16315
2095	23.15244
2100	22.92152