create a `data.frame` object of national level per month admissions, defaulters, and performance indicators

[ernestguevarra]

Might be good to have a single data.frame object that has national level indicators per year that looks something like this:

   Year admissions defaulters cure_rate death_rate default_rate non_response_rate
1  2016     224632      23558     0.856    0.0120        0.116             0.0160
2  2017     227419      20259     0.880    0.00940       0.0946            0.0165
3  2018     244796      16159     0.904    0.00849       0.0718            0.0161
4  2019     250568      14479     0.914    0.00793       0.0624            0.0155

which will look good as a table output but can also be visualised in a nice way like this: