Year	%
1997	9.413067552602437
1998	12.852552659764378
1999	12.773172569706118
2000	12.754743499648631
2001	13.162257144751674
2002	14.673721340388006
2003	14.141279765864049
2004	15.05111945127476
2005	14.62990561351217
2006	15.330450895614579
2007	16.098807495741056
2008	16.53089973663257
2009	17.492288150970786
2010	17.84536020634635
2011	18.165655079394266
2012	19.495949594959495
2013	20.68114511352419
2014	21.315422633379807
2015	21.604305484367
2016	22.06141684402555
2017	22.60083018400347
2018	23.30505888814305
2019	23.87446403049071
2020	24.605490382897646
2021	24.92982141790599
2022	25.336959806588094
2023	25.73060331733398