Year	Percent
1950	8.73437
1955	8.86988
1960	9.10567
1965	8.68034
1970	9.43826
1975	9.50627
1980	9.11144
1985	8.98893
1990	8.52985
1995	6.77736
2000	5.57607
2005	4.99677
2010	4.61038
2015	5.1757
2020	5.55766
2025	4.94769
2030	4.55608
2035	4.23943
2040	4.13996
2045	4.26287
2050	4.49682
2055	4.67803
2060	4.69095
2065	4.62042
2070	4.58846
2075	4.63186
2080	4.72717
2085	4.81918
2090	4.84799
2095	4.80974
2100	4.742