Year	Percent
1950	4.36265
1955	3.97513
1960	3.82896
1965	3.80162
1970	3.97596
1975	4.27634
1980	5.4048
1985	6.08578
1990	7.20384
1995	7.91053
2000	8.93351
2005	9.6413
2010	12.05412
2015	15.42976
2020	18.39451
2025	21.66749
2030	23.84668
2035	25.35688
2040	27.70848
2045	28.95404
2050	30.23841
2055	32.57376
2060	34.30954
2065	36.1834
2070	37.06983
2075	37.0983
2080	36.96952
2085	36.93078
2090	37.0422
2095	37.16806
2100	37.21728