Year	Percent
1950	10.01309
1955	10.21911
1960	9.52452
1965	10.06038
1970	10.66632
1975	10.89576
1980	11.15524
1985	10.51028
1990	10.02244
1995	10.27956
2000	10.33811
2005	9.4957
2010	8.80652
2015	8.45052
2020	7.62646
2025	6.84149
2030	6.56385
2035	6.20185
2040	5.83648
2045	5.52087
2050	5.2769
2055	5.0868
2060	4.94932
2065	4.86765
2070	4.79827
2075	4.74441
2080	4.71159
2085	4.69541
2090	4.69938
2095	4.71123
2100	4.71744