Year	Number
2005	1.0584980284567147
2006	2.2761163897615986
2007	3.4348384996575314
2008	3.938823169954816
2009	4.635108687056945
2010	4.638162230298766
2011	3.8901693638316432
2012	4.309356150336612
2013	3.2464621159457163
2014	2.6223341788689396
2015	1.4626472298203637
2016	2.4202992508483474
2017	2.3145700015917545
2018	2.795859708047823
2019	2.732129894068581
2020	3.027494657772448
2021	5.23087553614544
2022	5.386228459974465
2023	6.2483985105481015