*Excludes Observations that spanned multiple years

Pre 19703
19701
19710
19721
19730
19741
19751
19760
19770
19781
19793
19800
19811
19822
19836
19842
198512
19866
19877
19883
19893
19904
19914
19925
19935
19946
19951
199618
199738
199842
199944
200066
200141
200238
200346
200443
200552
200666
200742
200869
2009104
2010135
201199
201258
201339
201452
201533
20162
20170
20180
Total1205