Year Spring (95% CI) Autumn (95% CI)
2011 20.932 (15.809 to 29.746) -44.525 (-48.253 to -40.601)
2012 21.438 (19.727 to 23.146) -43.931 (-47.367 to -40.340)
2013 27.432 (25.804 to 29.129) -43.677 (-47.693 to -39.776)
2014 23.819 (22.364 to 25.148) -43.201 (-46.692 to -39.672)
2015 23.923 (22.530 to 25.338) -43.494 (-46.964 to -39.944)
2016 24.338 (22.925 to 25.727) -44.456 (-47.803 to -40.869)
2017 22.761 (21.478 to 24.114) -44.174 (-47.477 to -40.675)
2018 26.066 (24.622 to 27.529) -44.424 (-47.751 to -40.946)
2019 24.942 (23.549 to 26.324) NA