Year	Percent
1950	5.46905
1955	4.68933
1960	4.47071
1965	4.53486
1970	4.61416
1975	4.98315
1980	4.92539
1985	4.7738
1990	5.12845
1995	5.44233
2000	6.03484
2005	6.58197
2010	6.89592
2015	7.05611
2020	7.91126
2025	9.60149
2030	11.68278
2035	13.76405
2040	16.33154
2045	19.18667
2050	22.03797
2055	24.80486
2060	27.58712
2065	30.24619
2070	32.41851
2075	34.26071
2080	35.86294
2085	37.16589
2090	38.15206
2095	38.8267
2100	39.26147