WGPS2024_01

The main changes in the sixteen surveys from 2005 to 2023 are a rise in GOG from 14% in 2005 to 32% in 2012, which was largely at the expense of the OPE category, before it fell back in 2014 to 25%. In 2015 there was a recovery back to a 33% share, a fall in 2016 to 25%, before rising to 29% in 2017, 34% in 2018, 41% in 2019, 44% in 2020, 46% in 2021, 47% in 2022 and to just under 50% in 2023.