Year	Percent
1950	3.60305
1955	3.33199
1960	3.50128
1965	3.45406
1970	3.59627
1975	3.97722
1980	4.27303
1985	4.81719
1990	5.89503
1995	6.39057
2000	6.55633
2005	6.94052
2010	7.2055
2015	8.01511
2020	9.27707
2025	10.73159
2030	12.31948
2035	13.41713
2040	14.0393
2045	14.27988
2050	14.35874
2055	15.3166
2060	16.70641
2065	18.34491
2070	20.85445
2075	22.88904
2080	24.36201
2085	25.69239
2090	27.1136
2095	28.78879
2100	30.54387