2024 30 USC 2004 – National Research Council study

2023 30 USC 2004 – National Research Council study

2022 30 USC 2004 – National Research Council study

2021 30 USC 2004 – National Research Council study

2020 30 USC 2004 – National Research Council study

2018 30 USC 2004 – National Research Council study

2017 30 USC 2004 – National Research Council study

2015 30 USC 2004 – National Research Council study

2014 30 USC 2004 – National Research Council study