Year	Percent
1950	15.03312
1955	15.83267
1960	15.60574
1965	15.94593
1970	15.92616
1975	15.0477
1980	14.30308
1985	12.83119
1990	12.80704
1995	11.40915
2000	10.60335
2005	9.64243
2010	8.56002
2015	8.29738
2020	7.56131
2025	7.04677
2030	6.51902
2035	6.08196
2040	5.74174
2045	5.51183
2050	5.31677
2055	5.12283
2060	4.94778
2065	4.78238
2070	4.66342
2075	4.58691
2080	4.53495
2085	4.48171
2090	4.42622
2095	4.3809
2100	4.34971