2009: recorded on 18 dates between June 16th and September 24th with a peak count of four on July 3rd.
2010: recorded on 26 dates between June 15th and October 14th with peak counts of five on July 12th, 13th, 20th & 21st.
2011: recorded on 38 dates between May 30th and October 13th with peak counts of seven on July 15th & 26th.
2012: recorded on 20 dates between June 20th and August 10th with peak counts of four on July 12th & 27th.
2013: recorded on 25 dates between July 3rd and October 4th, with a peak count of 12 on July 17th.
2014: recorded on 40 dates between May 20th and September 30th, with a peak count of seven on July 8th.
2015: recorded on 47 dates between June 13th and August 21st, with a peak count of seven on July 26th.