Year	Percent
1950	15.95031
1955	14.5791
1960	14.63477
1965	15.35217
1970	17.02738
1975	15.95084
1980	12.92168
1985	13.12891
1990	14.06425
1995	13.04687
2000	13.62106
2005	13.06467
2010	13.10375
2015	12.88296
2020	11.65862
2025	10.62846
2030	10.36646
2035	10.40997
2040	10.34747
2045	9.99593
2050	9.34468
2055	8.64931
2060	8.20026
2065	8.04413
2070	7.93163
2075	7.68214
2080	7.26788
2085	6.8208
2090	6.47542
2095	6.29489
2100	6.19602