Here's a quick look at the vote shares of the party since the 1984 elections.

The Bharatiya Janata Party garnered 37.4% of the votes in the 2019 Lok Sabha elections. The NDA as a whole, received nearly 45% of the vote. This is the highest vote share received by the party nation-wide in any Lok Sabha election since the party was (re)formed in 1980.

Here's a quick look at the vote shares of the party since the 1984 elections. In previous elections, the party's earlier avatar, the Bharatiya Jana Sangh had contested elections either separately or merged within the Janata Party (in 1977 and 1980).

The BJP-led coalition (with the Shiv Sena, the Janata Dal (United), the Shiromani Akali Dal, the All India Anna Dravida Munnetra Kazhagam among others) won a cumulative vote share of nearly 45%, which is higher than what the NDA got in 2014 — 38%.

In contrast, the Congress party failed to improve on its vote share from 2014 and gathered 19.5% of the total votes.

The BJP and its allies have thus far not only increased their respective vote shares and seat shares from 2014, but also expanded their geographic reach in electoral success. Only the southern States, such as Tamil Nadu, Kerala and Andhra Pradesh, have bucked the trend.

The dominant victory of the BJP and its allies — by repeating the 2014 win, and then some — suggests that the era of coalitions (and/or a central government with a relatively weak national party in power) determining the balance of power at Delhi has decisively come to an end. This period, which began in 1977 following the end of Emergency, extended till 2014 with the notable exception of the Congress rule (with PM Rajiv Gandhi at the helm) between 1984 and 1989.

We could now characterise the period when the BJP came to power in 2014 as the beginning of a new single-party hegemonic system in Indian politics that was akin to what prevailed since Independence during the days of the “Congress system”. The 2019 Lok Sabha election trends so far has clearly affirmed this.