Returns a vector of years for which enrollment data is available.
Value
Integer vector of available years
Examples
get_available_years()
#> [1] 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
#> [16] 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024