Year	Percent
1950	9.20512
1955	8.28991
1960	7.69817
1965	8.70376
1970	8.87516
1975	7.65438
1980	7.66816
1985	7.46025
1990	7.20371
1995	7.61326
2000	7.03073
2005	6.24085
2010	5.03054
2015	4.57729
2020	4.41626
2025	5.08405
2030	5.33093
2035	5.14591
2040	4.81229
2045	4.52321
2050	4.49319
2055	4.74819
2060	5.0663
2065	5.20052
2070	5.11582
2075	4.95658
2080	4.8832
2085	4.94628
2090	5.06741
2095	5.13637
2100	5.08592