That does not change the results, it still only shows caches from 2001-12-xx and 2020-04-xx. Looking at the checker for https://coord.info/GC3T5TN
the requested option / additional filter would also display caches from the months ...
2002: February, June, September, October, November, December
2003: January, February, April
2004: April, July, December
2005: January, May, November
2006: August, November
... because I have not found caches *located in the Netherlands* that where placed in those months.