*Excludes Observations that spanned multiple years

Pre 197042
19700
19711
19720
19730
19742
19752
19764
19771
19780
19790
19801
19810
19820
19833
19840
19851
19863
19872
19881
19890
19904
19911
19923
19934
19942
19951
19961
19976
19980
19990
20000
20012
20020
20031
20040
20050
20060
20071
20081
20091
20100
20110
20120
20131
20142
20150
20160
20170
Total94