Year	Percent
1950	12.32436
1955	13.70638
1960	13.58749
1965	14.22027
1970	13.34346
1975	12.79113
1980	11.66099
1985	11.58458
1990	11.0918
1995	9.65827
2000	8.79562
2005	8.28083
2010	8.54462
2015	8.44285
2020	7.62379
2025	7.00534
2030	6.48294
2035	6.19962
2040	6.11963
2045	6.0209
2050	5.75687
2055	5.42352
2060	5.15557
2065	5.023
2070	4.99254
2075	4.98953
2080	4.90746
2085	4.76085
2090	4.62076
2095	4.55728
2100	4.57244