2011 - 20.5%

The 2011 20.5% is the baseline measurement.

2012 - 21.4%

The 2012 increase to 21.4% from 2011 represents a 0.9% increase YoY.

2013 - 21.6%

The 2013 increase to 21.6% from 2012 represents a 0.2% increase YoY.

2014 - 21.5%

The 2014 decrease to 21.5% from 2013 represents a -0.1% decrease YoY.

2015 - 20.6%

The 2015 decrease to 20.6% from 2014 represents a -0.9% decrease YoY.

2016 - 20.2%

The 2016 decrease to 20.2% from 2015 represents a -0.4% decrease YoY.

2017 - 18.3%

The 2017 decrease to 18.3% from 2016 represents a -1.9% decrease YoY.

2018 - 18.8%

The 2018 increase to 18.8% from 2017 represents a 0.5% increase YoY.

2019 - 16.5%

The 2019 decrease to 16.5% from 2018 represents a -2.3% decrease YoY.

2021 - 16.2%

The 2021 decrease to 16.2% from 2019 represents a -0.3% decrease YoY.

2022 - 16.4%

The 2022 increase to 16.4% from 2021 represents a 0.2% increase YoY.

2023 - 18%

The 2023 increase to 18% from 2022 represents a 1.6% increase YoY.