Year	Percent
1950	4.80926
1955	5.26272
1960	5.19459
1965	5.00709
1970	5.21691
1975	5.47304
1980	5.82249
1985	6.50118
1990	7.91135
1995	9.24245
2000	10.9695
2005	12.80396
2010	15.33641
2015	18.41774
2020	23.03465
2025	27.51341
2030	31.76683
2035	35.48893
2040	38.10449
2045	40.4754
2050	41.56305
2055	43.09663
2060	43.80997
2065	43.27486
2070	42.42255
2075	41.70072
2080	41.30443
2085	41.14758
2090	41.26471
2095	41.3284
2100	41.1959