git lg --since 353.days | cut -f 4- | grep 'Merge pull request' | wc -l
1612 merges to master
git lg --since 353.days | cut -f 1- | grep 'Merge pull request' | cut -f 3 | cut -d ' ' -f 2 | sort | uniq -c
46 Jan
31 Feb
89 Mar
119 Apr
139 May
140 Jun
133 Jul
137 Aug
191 Sep
285 Oct
201 Nov
101 Dec