Year	Percent
1950	11.80212
1955	11.39377
1960	12.46002
1965	12.94009
1970	12.83232
1975	12.29961
1980	10.30009
1985	7.26841
1990	7.50188
1995	7.52979
2000	7.74283
2005	8.17043
2010	7.84277
2015	7.3452
2020	6.82503
2025	5.68308
2030	5.72467
2035	5.99162
2040	6.29926
2045	6.28411
2050	5.98068
2055	5.63375
2060	5.4656
2065	5.51413
2070	5.60147
2075	5.57478
2080	5.42299
2085	5.24677
2090	5.15148
2095	5.15836
2100	5.21162