Year	Percent
1950	4.99051
1955	5.42638
1960	6.21806
1965	6.75704
1970	8.26695
1975	9.81489
1980	10.52264
1985	11.19859
1990	14.24082
1995	15.23504
2000	15.26383
2005	15.74318
2010	18.09598
2015	21.27407
2020	25.20898
2025	29.81726
2030	33.44778
2035	36.95689
2040	40.46364
2045	43.88477
2050	45.89988
2055	46.84318
2060	46.08874
2065	44.16754
2070	42.68523
2075	41.40442
2080	40.84291
2085	40.59981
2090	40.55417
2095	40.27523
2100	40.06164