*Excludes Observations that spanned multiple years

Pre 19700
19700
19710
19720
19730
19741
19755
19761
19771
19781
197911
198010
19813
19820
19831
19844
198511
19867
198711
19884
19890
19905
19911
19923
19931
19944
19955
19968
199716
199813
199922
200037
200123
200217
2003127
2004129
200598
2006131
200718
200815
200935
201051
201132
201210
20136
201412
201513
20167
20170
20180
Total910