pre_text: Industry Overview According to WSTS (an industry research firm), worldwide semiconductor industry sales were $412.1 billion in 2019, a decrease of approximately 12.1% from $468.8 billion in 2018. We participate in unit and revenue surveys and use data summarized by WSTS to evaluate overall semiconductor market trends and to track our progress against the market in the areas we provide semiconductor components. The following table sets forth total worldwide semiconductor industry revenue since 2015: (1) Based on shipment information published by WSTS. We believe the data provided by WSTS is reliable, but we have not independently verified it. WSTS periodically revises its information. We assume no obligation to update such information. As indicated above, worldwide semiconductor sales increased from $335.2 billion in 2015 to $412.1 billion in 2019. The decrease of 12.1% from 2018 to 2019 was the result of decreased demand for semiconductor products. Our revenue decreased by $360.4 million, or 6.1%, from 2018 to 2019.
table: Year Ended December 31, Worldwide Semiconductor Industry Sales (1) Percentage Change
table: (in billions)
table: 2019 $412.1 (12.1)%
table: 2018 $468.8 13.7%
table: 2017 $412.2 21.6%
table: 2016 $338.9 1.1%
table: 2015 $335.2 (0.2)%
question: Analyse this data from a financial earnings document. What is the change in Worldwide Semiconductor Industry Sales from Year Ended December 31, 2018 to 2019?