11. grafikoa. Tributu bilketaren bilakaera denboran
| 2007 | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | |
| Bilketa guztia | 4.569.565 | 4.310.608 | 4.068.713 | 3.954.898 | 4.034.191 | 4.070.844 | 4.368.385 | 4.255.034 | 4.398.742 | 4.563.541 | 4.959.181 | 5.107.259 | 5.508.405 | 5.047.688 |
| Itzulketak | 975.947 | 1.131.418 | 1.032.557 | 1.085.992 | 891.687 | 1.092.255 | 1.461.255 | 1.247.468 | 1.200.312 | 1.313.809 | 1.276.510 | 1.624.305 | 1.567.273 | 1.420.610 |
| Bilketa likidoa | 3.593.618 | 3.179.189 | 3.036.156 | 2.868.906 | 3.142.504 | 2.978.590 | 2.907.130 | 3.007.566 | 3.198.430 | 3.249.732 | 3.682.671 | 3.482.954 | 3.941.132 | 3.627.079 |
| Urteko aldaketaren tasa | 7,7% | -11,5% | -4,5% | -5,5% | 9,5% | -5,2% | -2,4% | 3,5% | 6,3% | 1,6% | 13,3% | -5,4% | 13,2% | -8,0% |