*Excludes Observations that spanned multiple years

Pre 197034
19700
19711
19720
19731
19741
19751
19761
19770
19781
19790
19801
19811
19820
19830
19840
19850
19861
19873
198821
198918
199049
199190
199217
199351
199456
1995168
1996242
1997242
199834
19997
20006
20019
200220
200385
200486
200598
200656
200765
200882
200978
201053
201153
2012134
2013335
2014454
2015374
2016290
20173
20180
Total3322