Year	Percent
1950	22.81986
1955	22.53235
1960	22.20526
1965	22.54191
1970	22.1277
1975	20.9098
1980	20.33919
1985	20.15702
1990	21.62999
1995	23.69058
2000	25.96479
2005	27.51987
2010	26.67678
2015	26.36336
2020	25.29045
2025	25.00698
2030	25.16572
2035	24.92273
2040	24.68792
2045	23.8572
2050	23.35586
2055	23.27681
2060	23.67801
2065	24.0118
2070	23.85418
2075	23.48435
2080	23.01704
2085	22.74104
2090	22.63829
2095	22.58897
2100	22.45496