Year	Percent
1950	16.07269
1955	17.06562
1960	16.90973
1965	16.91702
1970	17.18643
1975	17.58022
1980	17.82034
1985	17.9652
1990	18.1372
1995	18.35521
2000	18.46814
2005	18.89075
2010	19.09412
2015	18.40872
2020	17.53377
2025	16.83222
2030	16.16663
2035	15.38009
2040	14.48188
2045	13.53817
2050	12.64236
2055	11.84584
2060	11.10986
2065	10.45157
2070	9.82297
2075	9.22662
2080	8.69302
2085	8.19401
2090	7.75601
2095	7.37256
2100	7.02469