Year	Percent
1950	28.37359
1955	28.56312
1960	25.48778
1965	24.03253
1970	22.56609
1975	21.72344
1980	23.69014
1985	24.61042
1990	25.25053
1995	24.54821
2000	26.37011
2005	27.87395
2010	29.90208
2015	30.15778
2020	29.07766
2025	27.70243
2030	26.40141
2035	26.34668
2040	26.03282
2045	24.79778
2050	23.50989
2055	22.45172
2060	22.52273
2065	22.97732
2070	23.35523
2075	23.35629
2080	22.96155
2085	22.51423
2090	22.27651
2095	22.30246
2100	22.40786