Year	Percent
1950	5.7447
1955	5.61788
1960	5.55499
1965	5.52412
1970	6.06604
1975	6.00626
1980	6.14218
1985	6.49819
1990	7.55829
1995	7.99237
2000	8.93875
2005	10.34441
2010	13.05903
2015	13.77006
2020	15.13699
2025	17.09364
2030	19.13162
2035	21.26199
2040	22.2906
2045	22.8862
2050	24.04684
2055	25.74949
2060	27.11402
2065	28.23352
2070	29.20698
2075	30.34542
2080	31.40611
2085	32.332
2090	33.15016
2095	33.87779
2100	34.52991