Year	Percent
1950	13.36636
1955	14.28689
1960	14.31387
1965	14.42729
1970	14.55873
1975	14.87798
1980	15.27535
1985	15.08357
1990	14.94928
1995	15.62652
2000	14.37932
2005	13.3934
2010	12.38399
2015	12.14663
2020	11.80346
2025	11.34794
2030	10.56961
2035	9.80763
2040	9.21923
2045	8.77247
2050	8.33455
2055	7.8585
2060	7.37917
2065	6.95468
2070	6.61368
2075	6.34307
2080	6.11059
2085	5.90218
2090	5.70149
2095	5.53595
2100	5.40286