*Excludes Observations that spanned multiple years

Pre 197096
19700
197119
197210
19730
19740
19752
19761
19776
19780
19790
19801
19810
19820
19831
19841
19854
19860
19870
19881
19890
19902
19910
19922
19933
19948
19957
19962
19975
19984
19990
20004
20012
20023
20031
20040
20053
200659
20075
200820
200947
2010143
2011132
201297
201363
201415
201543
20168
20177
Total827