*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19740
19757
19766
19770
19789
19795
19802
19812
19824
198311
19845
19857
19864
19872
19883
19895
19907
19913
19922
19933
199412
199514
199643
1997142
199890
1999103
200062
200172
200297
2003127
200466
2005110
2006109
200783
200860
2009114
2010158
2011106
201292
201359
201458
201562
20166
20170
20180
Total1932