Year	Percent
1950	16.94795
1955	18.56449
1960	18.98134
1965	18.7423
1970	17.99875
1975	17.48173
1980	16.98624
1985	15.76298
1990	14.75693
1995	14.51302
2000	13.54214
2005	11.53864
2010	10.57944
2015	9.9903
2020	9.66847
2025	9.05643
2030	8.30481
2035	7.57697
2040	6.97068
2045	6.54015
2050	6.22495
2055	5.92372
2060	5.60791
2065	5.29874
2070	5.05198
2075	4.87657
2080	4.76674
2085	4.68914
2090	4.62353
2095	4.55321
2100	4.49348