Year	Percent
1950	13.34114
1955	14.34582
1960	13.42585
1965	13.83533
1970	14.20316
1975	14.51397
1980	14.74079
1985	15.24089
1990	15.55643
1995	15.43559
2000	15.80461
2005	15.89337
2010	16.20437
2015	15.35099
2020	13.59542
2025	12.72476
2030	11.74766
2035	10.9168
2040	10.1378
2045	9.38082
2050	8.64552
2055	7.962
2060	7.38305
2065	6.90309
2070	6.48925
2075	6.14377
2080	5.84616
2085	5.5961
2090	5.40108
2095	5.25458
2100	5.13451