Year	Percent
1950	11.82979
1955	12.35655
1960	12.114
1965	10.57847
1970	11.27135
1975	11.79345
1980	12.14786
1985	12.18313
1990	12.06753
1995	11.78857
2000	12.30833
2005	12.56804
2010	12.65246
2015	12.30971
2020	12.12054
2025	11.85497
2030	11.64523
2035	11.3712
2040	10.99998
2045	10.58209
2050	10.18388
2055	9.83449
2060	9.50598
2065	9.17515
2070	8.83539
2075	8.50476
2080	8.19764
2085	7.9146
2090	7.64491
2095	7.37654
2100	7.12514