*Excludes Observations that spanned multiple years

Pre 19702
19700
19710
19720
19730
19740
19750
19760
19770
19780
19790
19800
19810
19821
19830
19840
19850
198633
19875
198841
198915
19905
199126
19925
19935
19940
19955
19960
19974
19981
19996
2000140
200189
2002248
2003113
200471
200570
2006149
200754
2008144
20091917
201093
2011188
2012144
2013109
2014184
2015310
201652
2017110
201875
Total4414