Year	Percent
1950	13.14071
1955	14.03244
1960	14.34131
1965	14.69997
1970	15.14102
1975	11.69532
1980	11.00701
1985	11.02305
1990	12.26999
1995	10.47402
2000	8.24648
2005	6.81299
2010	6.81372
2015	7.08886
2020	6.92749
2025	6.24635
2030	5.65264
2035	5.33491
2040	5.31981
2045	5.43217
2050	5.45261
2055	5.31376
2060	5.12387
2065	5.02256
2070	5.04647
2075	5.14187
2080	5.20032
2085	5.16963
2090	5.0809
2095	5.01098
2100	5.00527