Year	Percent
1950	5.25561
1955	7.36693
1960	9.48698
1965	10.02269
1970	11.20026
1975	10.76514
1980	10.3212
1985	9.35976
1990	8.39283
1995	8.49131
2000	9.15306
2005	9.62624
2010	9.57753
2015	8.85431
2020	8.0067
2025	7.56809
2030	7.34873
2035	7.20285
2040	6.95759
2045	6.62027
2050	6.2702
2055	5.97479
2060	5.77962
2065	5.65019
2070	5.51939
2075	5.35498
2080	5.17908
2085	5.03168
2090	4.94285
2095	4.89393
2100	4.85697