Year	Percent
1950	13.52541
1955	13.33094
1960	13.32414
1965	14.07528
1970	14.51417
1975	14.63215
1980	14.54276
1985	16.05787
1990	16.99533
1995	16.08479
2000	14.09534
2005	11.9343
2010	9.72279
2015	10.05557
2020	10.88056
2025	10.24125
2030	8.97596
2035	7.63517
2040	6.79924
2045	6.49241
2050	6.42971
2055	6.28345
2060	5.93625
2065	5.50353
2070	5.16731
2075	5.02531
2080	5.02547
2085	5.04411
2090	4.97992
2095	4.837
2100	4.69716