Year % (cumulative) 1976 0.229230001568794 2006 11.3239498138428 2011 7.72812986373901 2015 8.25944042205811 2016 4.73807001113892 2017 9.08766078948975 2018 6.0479998588562 2019 7.70513010025024 2020 7.99977016448975