Time for this year's update of CdA membership numbers over the years, with the latest figure taken from page 326 of Accor's 2016 annual report.
2001: 3,000
2002: 5,000
2003: 5,500
2004: 6,600
2005: 7,000
2006: 7,300
2007: 7,600
2008: 7,800
2009: "nearly 8,000"
2010: "over 8,000"
2011: "more than 8,000"
2012: 8,143
2013: 8,591
2014: 10,050
2015: 4,086
2016: 4,637
So I was wrong to expect numbers to drop further during 2016.