*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
197236
19734
19740
19750
19760
19770
19781
19790
19801
19810
19820
19830
19840
19857
19869
198730
198840
198917
199051
199180
199264
199327
19941
199510
19961
19970
19980
199964
200058
200122
20023
20033
20043
20054
20062
20070
200815
20092
20101
20117
20129
20139
20145
201514
201612
201713
20180
Total625