Year	Percent
1950	9.02982
1955	11.77078
1960	12.85424
1965	11.21467
1970	10.48851
1975	10.10853
1980	11.08129
1985	10.92989
1990	9.9712
1995	9.23153
2000	8.74607
2005	9.00405
2010	8.63516
2015	8.90773
2020	9.24592
2025	8.57993
2030	8.07776
2035	7.77453
2040	7.65751
2045	7.59299
2050	7.47253
2055	7.21216
2060	6.88034
2065	6.56343
2070	6.33066
2075	6.17613
2080	6.03196
2085	5.86751
2090	5.66727
2095	5.46211
2100	5.29099