Year	Percent
1950	10.54867
1955	10.18268
1960	11.61574
1965	11.6409
1970	12.39674
1975	13.29434
1980	11.80851
1985	11.16881
1990	9.67694
1995	10.15316
2000	9.37359
2005	8.61039
2010	7.92557
2015	6.17857
2020	6.40591
2025	6.31136
2030	6.09681
2035	5.85395
2040	5.54932
2045	5.23739
2050	5.0459
2055	5.03539
2060	5.07802
2065	5.0533
2070	4.97435
2075	4.88472
2080	4.82865
2085	4.82312
2090	4.85277
2095	4.87113
2100	4.84952