Year	Percent
1950	9.63003
1955	10.21096
1960	11.27501
1965	12.27571
1970	13.48087
1975	12.54172
1980	10.58789
1985	9.33175
1990	8.14187
1995	8.00745
2000	8.36937
2005	7.63482
2010	6.42968
2015	5.86348
2020	5.36034
2025	5.48933
2030	5.54935
2035	5.45052
2040	5.36046
2045	5.26059
2050	5.19866
2055	5.20176
2060	5.22889
2065	5.21807
2070	5.15115
2075	5.0706
2080	5.00696
2085	4.96701
2090	4.94434
2095	4.91458
2100	4.87168