Year	Percent
1950	14.80437
1955	18.0221
1960	17.93682
1965	17.51433
1970	16.92946
1975	16.68532
1980	17.71556
1985	18.97846
1990	16.63555
1995	12.59704
2000	9.69182
2005	7.83512
2010	8.61439
2015	8.69386
2020	7.47298
2025	6.03995
2030	5.05027
2035	4.78039
2040	4.96107
2045	5.10704
2050	4.90895
2055	4.49054
2060	4.14139
2065	4.05433
2070	4.20799
2075	4.42469
2080	4.51261
2085	4.4353
2090	4.29536
2095	4.2393
2100	4.31188