Year	Percent
1950	22.90608
1955	18.32819
1960	14.66607
1965	12.40115
1970	10.77081
1975	9.85458
1980	9.60891
1985	9.74772
1990	10.03108
1995	10.70999
2000	11.3032
2005	11.68864
2010	12.65056
2015	14.15881
2020	15.9983
2025	17.55024
2030	18.45737
2035	18.46173
2040	18.84014
2045	19.69074
2050	21.22583
2055	22.63632
2060	23.1986
2065	23.30994
2070	23.06266
2075	23.20317
2080	23.53976
2085	23.78311
2090	23.76633
2095	23.50326
2100	23.14065