Year	Percent
1950	5.11848
1955	5.12241
1960	5.24174
1965	5.29628
1970	5.35444
1975	5.36579
1980	5.43513
1985	5.7703
1990	7.65256
1995	9.07048
2000	10.56003
2005	11.96328
2010	13.92723
2015	16.87074
2020	20.60864
2025	24.68294
2030	28.91348
2035	32.65396
2040	35.50568
2045	37.16065
2050	38.12045
2055	39.40564
2060	40.6057
2065	41.26767
2070	41.71444
2075	42.02411
2080	41.89983
2085	41.62561
2090	41.42046
2095	41.25555
2100	41.09917