Year	Percent
1950	9.6294
1955	10.58843
1960	9.56038
1965	7.28399
1970	9.47355
1975	8.95805
1980	8.71861
1985	7.47012
1990	7.30769
1995	5.28164
2000	4.82494
2005	4.72936
2010	4.91925
2015	4.61266
2020	4.50078
2025	4.3944
2030	4.29631
2035	4.27338
2040	4.32342
2045	4.34566
2050	4.32741
2055	4.31539
2060	4.32553
2065	4.37387
2070	4.44281
2075	4.504
2080	4.5287
2085	4.52755
2090	4.5152
2095	4.5146
2100	4.52239