Year	Percent
1950	11.0561
1955	16.23514
1960	17.81474
1965	18.22192
1970	16.25414
1975	15.54551
1980	15.28606
1985	15.59616
1990	15.72125
1995	14.39954
2000	11.49377
2005	9.71597
2010	10.32816
2015	10.32148
2020	9.48253
2025	8.292
2030	7.37716
2035	6.96967
2040	6.81296
2045	6.61668
2050	6.25392
2055	5.86087
2060	5.56932
2065	5.43279
2070	5.38002
2075	5.32724
2080	5.22967
2085	5.0998
2090	4.98861
2095	4.92928
2100	4.91349