<prompt> Translate the following text to EnglishKuokoa kwa jumla ya taifa, ambayo inaonyesha rasilimali zinazopatikana kwa ajili ya kubadilisha bidhaa za zamani, zilizoharibiwa na kupanua hisa za mtaji, imepanda kama sehemu ya pato la ndani la jumla GDP kutoka kiwango chake cha chini katika miaka ya 1990, lakini bado iko chini ya kiwango cha miaka ya 1960 tazama mchoro 2.1.  <response>: Gross national saving-which reflects resources available both to replace old, worn out capital goods and to expand the capital stock-has rebounded as a share of gross domestic product GDP from its low in the 1990s but remains below the level of the 1960s see figure 2.1. 