Year	Percent
1950	19.05502
1955	17.62278
1960	18.41475
1965	20.35359
1970	19.56229
1975	19.91063
1980	18.3297
1985	17.20494
1990	16.5272
1995	14.54692
2000	14.46533
2005	13.56906
2010	13.58441
2015	13.20707
2020	12.03699
2025	10.96854
2030	10.10177
2035	9.4858
2040	9.01868
2045	8.51632
2050	7.97015
2055	7.42886
2060	6.99753
2065	6.65981
2070	6.39391
2075	6.14239
2080	5.88442
2085	5.63605
2090	5.43075
2095	5.27749
2100	5.16876