Year	Percent
1950	12.483
1955	12.74284
1960	13.26299
1965	13.53273
1970	14.45189
1975	15.6722
1980	15.8064
1985	14.60452
1990	13.49717
1995	12.66668
2000	11.07094
2005	9.77135
2010	9.2905
2015	9.70559
2020	9.58075
2025	8.54189
2030	7.64557
2035	6.92285
2040	6.50544
2045	6.36616
2050	6.32965
2055	6.20815
2060	5.97223
2065	5.71166
2070	5.5414
2075	5.48035
2080	5.47834
2085	5.4591
2090	5.38359
2095	5.26573
2100	5.16786