Year	Percent
1950	13.88283
1955	14.16949
1960	14.42285
1965	14.57213
1970	14.83721
1975	15.1395
1980	15.29783
1985	15.26655
1990	14.85232
1995	14.16218
2000	14.35999
2005	14.23706
2010	14.12041
2015	13.58969
2020	12.9589
2025	12.41836
2030	12.00741
2035	11.6644
2040	11.26953
2045	10.80452
2050	10.32375
2055	9.88513
2060	9.50568
2065	9.17521
2070	8.86975
2075	8.54989
2080	8.22207
2085	7.9083
2090	7.62862
2095	7.38041
2100	7.12592