camel_index() for computing multivariate-weighted
CAMEL indices.plot_camel_index() for ggplot2-based
visualization.print.camel_index() and
summary.camel_index() methods.camel_2015,
camel_2016, camel_2017,
camel_2018, camel_2019,
camel_2020, camel_2021 and
camel_2022.