Year	Percent
1950	13.17911
1955	14.36446
1960	14.05488
1965	14.6394
1970	13.58928
1975	12.92425
1980	11.70457
1985	11.57064
1990	10.98771
1995	9.50418
2000	8.62586
2005	8.0373
2010	8.27536
2015	8.09682
2020	7.22494
2025	6.58536
2030	6.07324
2035	5.79127
2040	5.70082
2045	5.59873
2050	5.34605
2055	5.03269
2060	4.78452
2065	4.66599
2070	4.64553
2075	4.65333
2080	4.58818
2085	4.46036
2090	4.33531
2095	4.28002
2100	4.2982