Year	Percent
1950	17.40856
1955	17.73324
1960	15.58169
1965	14.09144
1970	11.37764
1975	9.54796
1980	8.30358
1985	9.73934
1990	7.78268
1995	8.30058
2000	7.25877
2005	5.90041
2010	6.12218
2015	5.02905
2020	5.02278
2025	5.20343
2030	5.39476
2035	5.3179
2040	5.0464
2045	4.79467
2050	4.73739
2055	4.87872
2060	5.04257
2065	5.07285
2070	4.96258
2075	4.80883
2080	4.73222
2085	4.74826
2090	4.82434
2095	4.86063
2100	4.82144