SITE # SAMPLES 1999 2001 2003 2005 2007 2013 2018 Total PA PA/Sample
DM 190 23 11 10 5 7 13 14 83 0.44
SH 152 - 13 9 5 10 11 8 56 0.37
E 101 - - 3 11 6 - 6 26 0.26
SN 78 6 - 7 - - - 3 16 0.21
Total PA 29 24 29 21 23 24 31 181
Total samples 48 48 84 63 74 51 106
PA/Sample 0.60 0.50 0.35 0.33 0.31 0.47 0.29