Year	Percent
1950	8.92728
1955	10.69182
1960	9.38497
1965	9.11583
1970	9.16052
1975	8.56156
1980	7.22774
1985	5.91898
1990	5.74787
1995	5.9748
2000	6.05472
2005	5.83687
2010	5.8168
2015	5.34302
2020	5.04586
2025	5.07921
2030	5.13032
2035	5.10334
2040	5.02168
2045	4.90831
2050	4.822
2055	4.82966
2060	4.90755
2065	4.95343
2070	4.93501
2075	4.86503
2080	4.79608
2085	4.76782
2090	4.77919
2095	4.79024
2100	4.77595