Year	Percent
1950	17.09568
1955	16.59848
1960	16.99865
1965	17.31692
1970	17.46321
1975	18.14077
1980	18.43063
1985	18.45847
1990	17.86764
1995	17.42217
2000	17.42959
2005	17.70531
2010	17.66015
2015	17.36452
2020	16.63502
2025	15.91039
2030	15.28673
2035	14.68995
2040	14.05954
2045	13.37984
2050	12.68843
2055	12.04868
2060	11.42962
2065	10.88564
2070	10.38601
2075	9.89427
2080	9.42641
2085	8.98305
2090	8.59013
2095	8.21583
2100	7.86825