Year	Percent
1950	15.83406
1955	14.99551
1960	14.12654
1965	13.46495
1970	13.0638
1975	12.81817
1980	12.95517
1985	13.38437
1990	13.7602
1995	14.96663
2000	16.26336
2005	17.5864
2010	19.07193
2015	20.08688
2020	20.97709
2025	21.86947
2030	22.78166
2035	23.55559
2040	24.19089
2045	24.46789
2050	24.61089
2055	24.73407
2060	24.80716
2065	24.91712
2070	24.81694
2075	24.5769
2080	24.28904
2085	23.99636
2090	23.706
2095	23.40579
2100	23.10438