Year	Percent
1950	4.54468
1955	4.51547
1960	4.50549
1965	4.62865
1970	4.91858
1975	5.34417
1980	5.56608
1985	5.84525
1990	7.06862
1995	7.6185
2000	8.33603
2005	9.44901
2010	11.05162
2015	12.75865
2020	15.15904
2025	17.98021
2030	20.55463
2035	22.59352
2040	24.96229
2045	27.68734
2050	30.45587
2055	32.92929
2060	34.95518
2065	36.27525
2070	37.47821
2075	38.3977
2080	39.06267
2085	39.46269
2090	39.70289
2095	39.8725
2100	40.02736