Year	Percent
1950	4.45102
1955	5.02741
1960	5.86998
1965	6.57591
1970	6.7185
1975	6.4683
1980	6.06806
1985	5.58506
1990	5.8957
1995	5.69704
2000	5.56802
2005	5.44657
2010	5.16502
2015	5.51442
2020	5.57787
2025	5.91427
2030	6.7568
2035	7.66073
2040	8.53836
2045	9.32035
2050	10.10739
2055	10.89758
2060	11.74802
2065	12.5539
2070	13.51544
2075	14.66185
2080	15.81371
2085	16.94955
2090	18.10172
2095	19.28401
2100	20.5004