2011 - 18.5%

The 2011 18.5% is the baseline measurement.

2012 - 18.1%

The 2012 decrease to 18.1% from 2011 represents a -0.4% decrease YoY.

2013 - 17%

The 2013 decrease to 17% from 2012 represents a -1.1% decrease YoY.

2014 - 16.7%

The 2014 decrease to 16.7% from 2013 represents a -0.3% decrease YoY.

2015 - 15.8%

The 2015 decrease to 15.8% from 2014 represents a -0.9% decrease YoY.

2016 - 13.4%

The 2016 decrease to 13.4% from 2015 represents a -2.4% decrease YoY.

2017 - 12.4%

The 2017 decrease to 12.4% from 2016 represents a -1.0% decrease YoY.

2018 - 12.8%

The 2018 increase to 12.8% from 2017 represents a 0.4% increase YoY.

2019 - 11.2%

The 2019 decrease to 11.2% from 2018 represents a -1.6% decrease YoY.

2021 - 11.3%

The 2021 increase to 11.3% from 2019 represents a 0.1% increase YoY.

2022 - 11.8%

The 2022 increase to 11.8% from 2021 represents a 0.5% increase YoY.

2023 - 11.3%

The 2023 decrease to 11.3% from 2022 represents a -0.5% decrease YoY.