"Figure 3: The professional, scientific and technical activities sector was one of the largest contributors to both monthly and rolling three-month growth in October 2019","" "Rolling three-month index, September to November 2017 until August to October 2019, September to November 2017 = 100 ","" "","" "Notes","1. Rolling three-month estimates are calculated by comparing GDP in a three-month period with GDP in the previous three-month period. For example, GDP in August to October compared with the previous May to July." "Unit","Rolling three-month index, September to November 2017 = 100" "","" " ","Index of services","Professional, scientific and technical" "Sep - Nov 2017","100.0","100.0" "Oct - Dec 2017","100.1","100.3" "Nov 2017 - Jan 2018","100.4","101.0" "Dec 2017 - Feb 2018","100.5","101.0" "Jan - Mar 2018","100.7","101.1" "Feb - Apr 2018","100.8","101.4" "Mar- May 2018","101.2","102.0" "Apr - June 2018","101.5","102.3" "May - July 2018","101.8","102.7" "June - Aug 2018","102.0","103.1" "July - Sep 2018","102.2","103.8" "Aug - Oct 2018","102.3","104.2" "Sep - Nov 2018","102.5","104.8" "Oct - Dec 2018","102.7","105.0" "Nov 2018 - Jan 2019","102.8","104.5" "Dec 2018 - Feb 2019","103.0","104.2" "Jan - Mar 2019","103.1","104.0" "Feb - Apr 2019","103.1","104.0" "Mar- May 2019","103.2","103.7" "Apr - June 2019","103.3","103.9" "May - July 2019","103.4","104.2" "June - Aug 2019","103.6","104.6" "July - Sep 2019","103.6","104.6" "Aug - Oct 2019","103.7","105.0"