| 2011 | 2014 | 2017 | 2020 |
---|---|---|---|---|
Low-income (%) | Â | Â | Â | Â |
 Low | 31.71 ± 8.24 | 30.74 ± 7.59 | 28.12 ± 7.97 | 26.87 ± 9.35 (-15.3%)* |
 Medium | 34.07 ± 12.07 | 33.07 ± 10.70 | 29.50 ± 9.08 | 27.34 ± 8.31(-6.73%) |
 High | 49.26 ± 23.01 | 48.80 ± 32.27 | 43.59 ± 27.58 | 45.62 ± 24.76 (-7.4%) |
Education (%) | Â | Â | Â | Â |
 Low | 45.52 ± 22.89 | 47.26 ± 29.75 | 46.35 ± 29.01 | 51.94 ± 26.75 (11.6%) |
 Medium | 34.33 ± 8.71 | 32.57 ± 8.50 | 30.56 ± 9.70 | 30.15 ± 17.73(-12.2%) |
 High | 27.21 ± 7.40 | 28.20 ± 7.27 | 26.58 ± 6.81 | 25.32 ± 6.40(-6.9%) |
Tax payment | Â | Â | Â | Â |
 Low | 42.43 ± 17.90 | 30.61 ± 10.57 | 24.82 ± 27.60 | 32.08 ± 16.36(-24.4%) |
 Medium | 33.39 ± 15.68 | 39.09 ± 21.08 | 34.38 ± 18.00 | 22.52 ± 6.08(-32.6%) |
 High | 28.62 ± 8.06 | 32.17 ± 17.21 | 29.97 ± 14.42 | 19.11 ± 6.50(-35.7%) |