2011 - 23.1%

The 2011 23.1% is the baseline measurement.

2012 - 22%

The 2012 decrease to 22% from 2011 represents a -1.1% decrease YoY.

2013 - 21.5%

The 2013 decrease to 21.5% from 2012 represents a -0.5% decrease YoY.

2014 - 22.3%

The 2014 increase to 22.3% from 2013 represents a 0.8% increase YoY.

2015 - 21.8%

The 2015 decrease to 21.8% from 2014 represents a -0.5% decrease YoY.

2016 - 19.9%

The 2016 decrease to 19.9% from 2015 represents a -1.9% decrease YoY.

2017 - 18.3%

The 2017 decrease to 18.3% from 2016 represents a -1.6% decrease YoY.

2018 - 18.8%

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

2019 - 15.9%

The 2019 decrease to 15.9% from 2018 represents a -2.9% decrease YoY.

2021 - 16.5%

The 2021 increase to 16.5% from 2019 represents a 0.6% increase YoY.

2022 - 18.8%

The 2022 increase to 18.8% from 2021 represents a 2.3% increase YoY.

2023 - 21.1%

The 2023 increase to 21.1% from 2022 represents a 2.3% increase YoY.