Add IRS Tables overview to docs

vignettes/international-mortality-tables-overview.Rmd

@@ -1448,6 +1448,17 @@ Source: [https://content.naic.org/sites/default/files/pbr_data_valuation_manual_
 
 [TODO]
 
+
+IRS valuation tables (https://www.irs.gov/pub/irs-pdf/p1457.pdf):
+* US1983, 3.5%  (1.1.1951-31.12.1970)
+* Table LN, 6% (1.1.1971-30.11.1983)
+* Table CM, 10% (1.12.1983-30.4.1989)
+* Table 80CNSMT, §7520 rates (1.5.1989-30.4.1999)
+* Table 90CM (1.5.1999-30.4.2009)
+* Table 2000CM (1.5.2009-...)
+
+
+Standard Industrial Mortality Tables
 * 1941 CSI Table (Commissioners' Standard Industrial Mortality Table)
 * 1941 SSI Table (Sub-Standard Industrial Mortality Table)