Year	Percent
1950	11.59477
1955	10.78158
1960	10.44889
1965	12.93196
1970	12.55929
1975	12.45033
1980	12.24622
1985	12.63353
1990	13.02802
1995	12.88794
2000	12.99466
2005	12.76269
2010	12.60368
2015	12.9433
2020	13.30105
2025	13.09253
2030	12.70341
2035	12.42232
2040	12.19283
2045	11.93556
2050	11.63543
2055	11.28953
2060	10.92417
2065	10.57138
2070	10.23903
2075	9.93003
2080	9.63045
2085	9.32886
2090	9.03871
2095	8.76573
2100	8.49843