Year	Percent
1950	5.40326
1955	5.5447
1960	5.54012
1965	5.35364
1970	5.09036
1975	4.75581
1980	4.37647
1985	3.71817
1990	4.30541
1995	4.30876
2000	4.42691
2005	4.44954
2010	4.48347
2015	5.23727
2020	6.37548
2025	8.44556
2030	11.03412
2035	14.39958
2040	17.87464
2045	20.44529
2050	22.91077
2055	25.10126
2060	26.24188
2065	27.06836
2070	28.22009
2075	29.58372
2080	31.24482
2085	32.60806
2090	33.5231
2095	34.12527
2100	34.60133