15. The overall target degree of solvency, which cannot exceed 100%, corresponds:1° at 31 December 2011 and at 31 December 2012, to the overall degree of solvency at 31 December 2010;
2° at 31 December 2013, to the overall target degree of solvency at 31 December 2012, increased by one percentage point;
3° at 31 December 2014, to the overall target degree of solvency at 31 December 2013;
4° at 31 December 2015, to the overall target degree of solvency at 31 December 2014, increased by one percentage point;
5° at 31 December 2016, to the overall target degree of solvency at 31 December 2015, increased by one percentage point;
6° at 31 December 2017, to the overall target degree of solvency at 31 December 2016, increased by 2 percentage points;
7° at 31 December 2018, to the overall target degree of solvency at 31 December 2017 increased by 3 percentage points;
8° at 31 December 2019, to the overall target degree of solvency at 31 December 2018, increased by 2 percentage points.