Year	Percent
1950	10.57119
1955	11.15467
1960	9.11946
1965	8.44269
1970	8.22579
1975	8.41224
1980	8.47483
1985	7.97629
1990	7.38429
1995	6.50538
2000	6.04038
2005	5.52173
2010	5.15935
2015	5.04741
2020	5.00813
2025	4.92698
2030	4.80395
2035	4.69064
2040	4.61629
2045	4.57623
2050	4.57965
2055	4.58869
2060	4.57317
2065	4.54917
2070	4.52763
2075	4.52964
2080	4.55143
2085	4.57488
2090	4.57952
2095	4.56771
2100	4.54621