Year	Percent
1950	4.01307
1955	4.25495
1960	3.91325
1965	5.02024
1970	6.10494
1975	6.71139
1980	6.74721
1985	6.40435
1990	7.45238
1995	8.015
2000	8.56769
2005	8.58038
2010	8.75756
2015	10.22345
2020	12.64875
2025	15.78976
2030	17.90604
2035	19.59689
2040	21.19945
2045	22.82599
2050	24.35314
2055	26.10861
2060	27.87889
2065	29.33189
2070	30.97041
2075	32.38781
2080	33.68199
2085	34.7502
2090	35.61905
2095	36.38237
2100	37.11597