2011 - 19.7%

The 2011 19.7% is the baseline measurement.

2012 - 18.2%

The 2012 decrease to 18.2% from 2011 represents a -1.5% decrease YoY.

2013 - 19.3%

The 2013 increase to 19.3% from 2012 represents a 1.1% increase YoY.

2014 - 18.7%

The 2014 decrease to 18.7% from 2013 represents a -0.6% decrease YoY.

2015 - 18.1%

The 2015 decrease to 18.1% from 2014 represents a -0.6% decrease YoY.

2016 - 20.9%

The 2016 increase to 20.9% from 2015 represents a 2.8% increase YoY.

2017 - 19.9%

The 2017 decrease to 19.9% from 2016 represents a -1.0% decrease YoY.

2018 - 19.8%

The 2018 decrease to 19.8% from 2017 represents a -0.1% decrease YoY.

2019 - 16.5%

The 2019 decrease to 16.5% from 2018 represents a -3.3% decrease YoY.

2021 - 20.9%

The 2021 increase to 20.9% from 2019 represents a 4.4% increase YoY.

2022 - 16.8%

The 2022 decrease to 16.8% from 2021 represents a -4.1% decrease YoY.

2023 - 20.9%

The 2023 increase to 20.9% from 2022 represents a 4.1% increase YoY.